Companies are buying into wellness programs in a big way—especially financial wellness—and offering substantially larger financial incentives to employees and even their significant others to woo them into participating.

That's according to the eighth annual survey on corporate health and well-being from Fidelity Investments and the National Business Group on Health, which finds that companies are increasingly realizing how financial wellness impacts employee's overall health and acting accordingly.

Not only are some 84 percent of companies now using financial security programs, such as access to debt management tools or student loan counseling, in their well-being strategies—up from 76 percent last year—but financial security programs are the third most popular offering, after physical well-being programs (95 percent) and emotional health programs (87 percent).